Boiler



(No Model.)

F. X. FISCHER.

BOILER.

No. 480,081. Patented Aug. 2, 1892.

UNITED STATES PATENT OFFICE.

FRANK X. FISCHER, OF OAKLAND, CALIFORNIA.

BOILER.

SPECIFICATION forming part Of Letters Patent No. 480,081, dated August2, 1892. Application filed March 6, 1889. Serial No.802,l52. (No model.)

To all whom it may concern.-

Be it known that I, FRANK X. FISCHER, of Oakland, Alameda county, Stateof California, have invented an Improvement in Boilers; and I herebydeclare the following to be a full, clear, an d exact description of thesame.

My invention relates to the class of boilers, and particularly to theclass of portable boilers; and my invention consists in the constructionand combination of devices which I shall hereinafter fully describe andspecifically claim.

The object of my invention is to provide an economical and effectiveboiler, more particularly a portable boiler, of that type known asreturn-flue boilers, and which are specially adapted for burning straw,and are consequently most used in the harvest-field either for atraction or a thrashing engine, a harvester, or other movableimplements.

Referring to the accompanying drawings for a more complete explanationof my invention, Figure 1 is a vertical longitudinal section of myboiler. Fig. 2 is a cross-section taken at its larger or front end andshowing it mounted on a rear axle. Fig. 3 is a crosssection taken at itssmaller or rear end and showing it mounted on a forward axle.

A is the shell of the boiler. This is made tapering, as shown in Fig. 1,from its front to its rear end. The larger or front end of the boiler ismounted upon an axle B, which is the rear axle of a wheeled frame,unnecessary herein to show, said rear axle having its middle portioncurved to form a secure seat corresponding with the curvature of theshell. The smaller or rear end of the boiler is mounted upon an axle C,which is the forward axle of said wheeled frame and which is pivotallyheld to the shell by a headed bolt 0, as shown. The first advantage ofthis construction and mounting of the shell of the boiler is that byhaving a small end supported on the forward axle this axleneed not bemade unduly long, but can be made short, so as to provide asuitablynarrow gage of carrying-frame, and yet perform its functions ofturning without being impeded, as would be the case if the boiler wereas large at that end as at the other, and by having it tapering Ipreserve a D is the main or direct flue of the boiler.

With its forward end communicates the feedpassage d, and within its baseat its forward end are the grate-bars cZ, under which is the ash-pit Therear end of the main flue communicates with the combustion-chamber E,with which also communicates the rear ends of the forwardly-extendingreturn-tube flues F, the forward ends of which open into the stack G.

His the bridge-plate in the combustionchamber.

I is the water-space around the fines, and J is the steam-dome.

It will be seen by reference to Fig. 1 that the main flue D is madetapering from its front to its rear end. The advantages of thisconstruction are improved draft, greater strength, preserving a requireddiameter for the fuel-feed at its forward end, and conform ing better tothe shape of the shell, the tapering form of which has, therefore, thesecond advantage of providing in the best manner for the tapering mainflue D. Theshape of this fine and its low position in the shell alsohave the advantage of not rendering it liable to be exposed above thewater during the transportation of the boiler or when stationary ormoving on uneven ground; and further I am enabled to insert a greaternumber of return-tube flues above the main or direct flue.

The base or foot of the Water-space at the front end of the boiler issufficiently. large to permit the placing, of hand-holes K, convenientlylocated at each side. The tapering shape of the shell, providing adownward incline to the front end, causes the mud to settle down to alarger space at the front, from which it can readily and conveniently beremoved through the hand-holes.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

The combination, with a boiler having one end smaller than the other, ofa wheeled frame having a rear axle provided with a In Witness whereof Ihave hereunto set my curved seat at its middle portion, adapted to hand.receive the larger end of the boiler, and a front axle supporting thesmaller front end of said boiler and pivotally secured thereto, so thatWVitnesses: it may turn about its pivot Without impedi- KIRK KIMMEY,ment, substantially as herein described. J. H. BLOOD.

FRANK X. FISCHER.

